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    Author(s): Antonio Davila; Gary M. Scott; John H. Klungness
    Date: 1998
    Source: TAPPI Journal. 81(7): 145-148
    Publication Series: Scientific Journal (JRNL)
    Station: Forest Products Laboratory
    PDF: Download Publication  (77.0 KB)


    The objective was to investigate and compare methods for quantifying the concentrations of different plastics in stock samples. Five types of plastics were added to clean, bleached, hardwood pulp stock. The plastics concentrations in the stock samples were 0.10%, 0.50%, 1.0%, and 2.0 %, based on the oven-dried weight of the pulp. Samples were processed and analyzed by four quantification methods: image analysis, screening, passage through a hydrocyclone, and vacuum flotation. Screening was the most efficient and reliable method for quantifying plastics.


    As recyclers delve deeper into the waste stream to recover fiber, they will need efficient methods for quantifying the amounts of plastic contaminants in the recycled wastes.

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    Davila, Antonio; Scott, Gary M.; Klungness, John H. 1998. An evaluation of quantification methods for plastics. TAPPI Journal. 81(7): 145-148.


    Bleached pulps, contraries, evaluation, hardwood pulps, plastics, quantitative analysis, reclaimed fibers, recycling, screening, stickies, test methods, waste papers

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